Circular kiln or oven.



J. T 8: J. W. HARTLEY.

GULAR KILN 0R OVEN. APPLIdATION FILED MAR. 6, 1911.

Patented May 28, 1912. SSHEET 1.

3 SHEET a; 3m d J. LUNT & J. W; HARTLEY. GIRUULAB KILN 0R OVEN.

APPLICATION FILED MAR. 6, 1911. V 1 028,943, 7 Patented May 28, 1912.

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;r. LUNT & J. W. HARTLEY. CIRCULAR KILN OR OVEN.

APPLICATION FILED MAR. 6, 1911.

Patented May 28, 1912.

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1 FFTC i JOSEPH LUNT, OF STOKE-UPON-TRENT, AND JOHN WILLIAM HARTLEY, 0F STONE, ENGLAND.

CIRJULAR KILN 0R. OVEN.

Specification of Letters Patent.

Patented May28, 1912.

Application filed March 6, 1911. Serial No. 612,571.

Tooll whom it may concern:

Be it known that we, JOSEPH LUNT and JOHN lVILLiAM l'lARTLEY, subjects of the King of England, residing at Stoke-upon- Trent and Stone, respectively, in the county of Stafford, England, have invented certain new and useful Improvements in Circular Kilns or Ovens; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

This invention relates to kilns or ovens for use in the firing, heating, annealing or drying of pottery, glass enamel goods, ores,

sand and other materials, and particularly to circular kilns 0r ovens wherein the firing zone is usually on one side oft-he kiln and the opening on the opposite side. In this particular type of kiln, the wares, or other contents, pass through an annular chamber,

. forming the kiln proper, the contents being carried in metal baskets or the like. The baskets are usually supported either on rollers, or sliding plates which rest on the bottom of the kiln, or on wheeled carriages which travel on a rail track below the kiln bottom, the carriages carrying the baskets around by means of supports pass-- ing through an annular slot in the bottom of the kiln. The heat of the kiln in the latter case is retained by fence plates which plow through sand filled grooves or channels which are diflicult of access under present conditions and frequently become defective resulting in considerable loss of heat, and as the fiues' cannot pass beneath theannular chamber, bottom heat cannot easily be secured.

kiln and in the power required to move. the vwares or product belng heated.

The invention consists in providing'a circular slot or groove in the roof of the kiln in order that the baskets or the like, or their carriers, may be suspended from without the kiln.

The invention also consists in suspending baskets or their carriers by links or the like members passing through the annular or circular slot in the roof of the annular chamber; in carrying the llnks by suitable'traveling means situated outside the kiln; and in fitting said carrying means with fence plates adapted to plow through sand filled grooves or channels in the outer surface of the roof of the chamber.

The invention further consists in carrying the links or the like upon a turntable in the form of a trussed frame or other strucbricks forming the sides of the sandgrooves, and other details hereinafter referred to.

The accompanying drawings illustrate several forms of kiln according to the present invention.

Figures 1 and 2 are cross-sectional elevations through the charging and discharging positions of one form of kiln illustrated by way of example for use in the roasting of ores or sand. Fig. 3, is a detail side elevation illustrating one mode of discharging the buckets. Figs. 4 and 5 are respectively a plan, half in section, and a sectional elevation of another form of the invention illustrated by way of example for use in the heating, firing or drying of pottery, enamel goods or the like. Fig. 6, being a crosssectional elevation of the same on a larger scale. Figs. 7 and 8, are respectively a sectional elevation and a part plan illustratin an alternative mode of mounting the trusse frame.

In carrying out the invention according to one mode, for example, as applied to a kiln for roasting sand or ores, and as illustrated in Figs. 1 to 3, the annular chamber a, of the kiln is provided with an annular or circular slot 1), in the roof 0. The buckets d, for sand or other material, are pivoted on trunnions 3, to a frame of bars 0, carried by suitable suspending members such as hangers or links e, which pass through the slot Z), and are suspended from an iron frame 7', fittedwith wheels 9, running on rails 71., mounted on the top of the chamber a. The frame f, or links 6, are provided with fence plates 2', which enter and plow through sand in grooves or channels In, so as to prevent loss of heat through the slot b. The frame f, can be traveled around on the rails in an suitable manner either by hand or power, 'or instance, a handle 1, may drive the frame through reduction gearing m, the lastpinion m of which meshes with an annular rack m The buckets (Z, may be successively charged with sand or other material through a chute 4, Fig. 1, and as they reach a discharge chute 5, Fig. 2, they may be automatically tipped to discharge their contents therethrough. For instance, short levers 6, on the trunnions of the buckets may engage a fixed pin or stop 7. Fig. 3,

the buckets being so balanced that they return to the horizontal position after discharging. The adjacent buckets overlap each other at their ends.

In another mode of carrying out the invention, in the application to a kiln for firing or heating pottery, enamel wares, or the like purposes and as illustrated by Figs. 4 to 6, the baskets or crates d, are carried upon an annular frame 0, preferably constructed in segments, the frame 0, being suspended by links 6, slung from a revolving circular upper frame as, preferably of trussed formation. The frame :0, rotates about a central pillar p, having a ball or roller bearing g, on a brickwork or other foundation which is distinct from the brickwork of the kiln proper or chamber a. In this way the chamber a, is relieved of the weight'of the crates and traveling frame; and the liability to dama e or dislocation. of. the brickwork by the vibration of the traveling Wheels is avoided.

In applying the invention to a kiln having a central chimney, and as illustrated in Figs. 7 and 8, the trusses of the frame :12, 'may be carried upon suitable rings 8, 9 encircling the chimney.

In order to steady the frame 2, a series of rollers 1', may bearranged in suitable posi- 'UlOIlS, for instance, at the outer ends of the horizontal members of the trusses, the rollers r, resting lightly on a metal band or rail 8, extending around the kiln, and also serving as a tie-band.

character. of the The roof of the chamber a, may be formed of fire-bricks t, suitably ra'bbeted together and are provided with the sand grooves k; and an abutment u, may be erected to take the tie-band s.

In addition to fence plates 2?, fire-clay tiles or iron plates 11,, .may be placed over the circular slot I), as an additional preventive against loss of heat. The tiles or plates u, may be supported loosely within and upon the fence plates, so that they may yield if, during the revolution of the frame 00, the tiles should press upon the inner walls 1;, of the said grooves.- The inner walls 0, are preferably raised above the outer walls to prevent sand falling through the slot 1). Shields 12, may be fitted on the hangers e, to divert-any sand which may happen to fall in. In order to insure against the groove or slot 7), being closed, due to expansion of the kiln, a tie-band 10, is arranged against the one side of the inner sand groove k, and a similar band 11, may also be prohand; for instance, the horizontal members may be prolonged to form handles 13, the arrangement greatly reducing the power required compared with that first described with reference to Figs. 1 and 2.

The basketsoor crates d, are preferably placed upon the lower frame 0, by a. forked lever through a side door 14, Fig. 5, opposite to the heated zone, the frame beingv recessed to allow clearance for the arms of the lever to pass beneath the baskets.

In Figs. 4 and 6, the furnace is indicated at 15, the gases from which pass through flues 16, under the bottom of the kiln or chamber a, up three lines 17, on each side, down the next three flues 18, under. the bottom again, up the succeeding three flues 19, along the side and then down the last three flues 20, and thence to the chimney 21. It will be understood, however, that the arrangement of heating may be varied to suit the goods or materials to be treated, and that the invention is not confined to any-particular arrangement of crate or carrier as such a detail may be varied to suit the character of the goods to be treated, for instance the crates maybe arranged in tiers.

We claim 1. In combination with the side walls and floor of a. circular kiln, overhanging brickwork roof parts, said parts being spaced so as to leave between them an annular slot, and means for retaining said slot in circular form, "an arm supported transversely to said slot,a suspending rod sup- 1'0 I arm, and passing through said slot, supportand a central ported from said arm, and passing through said slot and supporting cages carried by said suspending rods.

2. In combination with the side walls and floor of a circular kiln, overhanging brickwork roof parts, said arts being spaced so as to leave between em an annular slot, means for retaining said slot in circular form, an arm supported transversely to said slot, a suspending rod supported from said ing cages carried by said suspending rods pivot from which said arms radiate. p

3. In combination -witll the side walls and floor of a circular kiln, overhanging brickwork roof parts, said parts being spaced so as to leave between them an annular slot, means for retaining said slot in circular form comprising a metal bindin ring located on said roof radially within said slot, transverse barssupported above said annular slot, suspending rods carried by said transverse bars and passing I throu h said slot and supporting cages carried y said suspending rods.

4. In combination with the side walls and floor of a circular kiln, overhanging brickwork roof parts, said parts being spaced so as to leave betw'en them an annular slot, means for retaining said slot. in circular form com rising a metal binding ring located on said roof radially withinsaid 'slot, a central pivot, arms radiating from said pivot and extendin above said annular slot, suspending r0 5 supported from said arms and passing through said slot and supporting cages within said kiln and carried by said, suspending rods.

5. In comblnation with the side walls and floor of a'circular kiln, overhanging brickwork roof parts, said parts being spaced so tile plates carried by said suspending rods 1 and movable over said slots and fence plates projecting from the ends of said'tile plates and plowlng in said sand channels.

6. In combination with the side walls and floor of a circular kiln, pVerhanging brickwork roof parts, said parts being spaced so as to leave between them an annular slot, means for retaining said slot in circular, form comprising a metal binding rin located on said roof radially within said slot, a central pivot,. arms radiating from said pivot and extending above said annular slot, suspending rods supported from said arms and passing through said slot,

supporting cages within said kiln and carried by said suspending rods, bearer wheels on" the end of said radiating arms and a bearer rail on the roof of the kiln and near the outer wall of the same, on which rail said bearer wheels rest.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

JOSEPH LUNT. JOHN WILLIAM HARTLEY.

Witnesses:

P. PLAN'r, JOHN H. COPESTAKE. 

